The CT55 is a pick custom designed by Chris Thile for his personal use. It is very similar in size and shape to our TAD line of picks. However it is only manufactured in 55/1000 of an inch(1.4mm) thickness and has a custom bevel per his specifications. This is the exact pick that Chris Thile is currently using. See his thoughts on this pick on our users page. Also Included Leather Keychain Pick Holder!(bluechippick.net)